currency.h

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// Based on "Design Patterns: Elements of Reusable Object-Oriented Software"
// book by Erich Gamma, John Vlissides, Ralph Johnson, and Richard Helm 
//
// Created by Bartosz Rachwal. The National Institute of Advanced Industrial Science and Technology, Japan.

#ifndef STRUCTURAL_COMPOSITE_CURRENCY_H_
#define STRUCTURAL_COMPOSITE_CURRENCY_H_

namespace structural
{
namespace composite
{
class Currency
{
    public:
    explicit Currency(const double&);

    double value() const;
    void value(double);

    friend bool operator==(const Currency& left, const Currency& right);
    friend bool operator!=(const Currency& left, const Currency& right);

    private:
    double value_;
};

inline bool operator==(const Currency& left, const Currency& right)
{
    return left.value() == right.value();
}

inline bool operator!=(const Currency& left, const Currency& right)
{
    return left.value() != right.value();
}
}
}
#endif